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Most just say during Chaotic World it's chaotic so anything could happen.
I see that if we're to accomplish anything interesting with the weather, this perception needs to be debunked.
There are several definitions of chaos, but the one relevant to us is the following: "a state of utter confusion or disorder; a total lack of organization or order"
The definition of this has been twisted several times to imply that it can only be bad. All chaos means is that it doesn't make sense, is completely random, or both.
If the chaotic realm was chaotic in the literal sense, anything can and should be happening.
Several chaotic hurricanes could strike in a row.
Azzazoth's Staff could randomly fall out of the sky next to you and combust the instant you touch it, wiping out everything on the map.
A disfigured limb of the Forgotten Leader could fly into you at 500 mph.
Your enemies could turn into gold coins when you hit them.
In other words, if the chaotic realm was chaotic in the literal sense, the game would have no point if not be rendered outright unplayable.
In games, gameplay always has to come before realism if you want your game to work. It's that simple.
Given that, let's analyze what the current weather does.
Divine Grace: Maxes out both speeds.
Sunny: Increases both speeds.
Clear: Inert.
Rain/Heavy Rain: Movespeed reduction.
Snow/Heavy Snow: Reduces both speeds.
Fog: Reduces attackspeed.
Hurricane: Maximally reduces both speeds.
Fairly early on, there comes a point where heroes' attackspeeds max out and Divine Grace/Sunny become redundant (about level 100 with decent items?). Rain/Snow aren't that bad in the normal world since there are items with blink and the attackspeed reduction isn't that bad, but once you go into the Chaotic Realm, they make your life miserable until you get Thanatos's Wings (a significant chunk of the game later at 775). I don't see Chaotic Fog/Hurricane that often, but I know that they've rendered me combat-inept when they have appeared.
So basically, a 50% chance (+ whatever Divine Grace is) for no substantial benefit once you're past level 50-100 or a 50% (- Divine Grace) chance to be epically ruined until the weather switches again.
Opponents of changing the weather will argue that you can simply hide in Struggle or Colo to avoid the weather. The Infinite Struggle only remains EXP-efficient for so long, and the Colo's XP rate runs down too quickly for it to retain efficiency for the duration of the night, not to mention the fact that you can't do either anyway if Sins are camping the entrance.
If the negative weather isn't going to be counterable by people who don't have certain items, then it should either be nerfed or the positive weather should actually do something substantial.
For example (suggesting these to get the point across, not arguing that they're balanced/awesome/what have you):
Chaotic Sun: The sun's rays burst into the chaotic realm, weakening enemies severely by halving their armorcounts.
Chaotic Influence: The energies of the chaotic realm solidify into spikes on your body. 10% damage return.
Chaotic Hurricane: A hurricane moves around the map, massively slowing (and possibly dealing 0.05% max HP damage per second) to anything inside it. The hurricane covers roughly 1/8 of the map at any given time.